Related Party Transactions

12 Months Ended

Dec. 31, 2017

Related Party Transactions:

Our consolidated statements of income include sales to and purchases from unconsolidated affiliates in the ordinary course of business as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
Sales to unconsolidated affiliates	$	29,514	$	29,651	$	24,180
Purchases from unconsolidated affiliates^(a)	$	209,266	$	130,287	$	115,697


(a)	Increase in 2017 primarily due to material purchases from our Windfield joint venture.

Our consolidated balance sheets include accounts receivable due from and payable to unconsolidated affiliates in the ordinary course of business as follows (in thousands):



	December 31,
	2017		2016
Receivable from related parties	$	2,406	$	2,159
Payable to related parties	$	55,801	$	38,466